Brake



Feb. 28, 1933. K M Yog-r 1,899,601

BRAKE Filed oct. 29, 1930 IN VEN TOR 1 KARL M. Yosr A TTORNE Y Patented Feb. 28, 1933 l UNITED STATES yresisten PATENT `OFFICE.

' KARL M. YOST, OF SOUTHA BEND, INDIANA, ASSIGNOR TO BENDIX BRAKE COMPANY,

F SOUTH BEND, INDIANA, A CORPORATION OF ILLINOIS BRAKE .Application led October 29, 1930. Serial No. 491,827.

This invention relates to brakes and is illustrated asembodied in an internal expanding brake for an automobile. An object of the invention is to provide operating means for a brake of the shiftable-anchorage type which will permit the mounting of the brake on a front wheel and more particularly which will permit the use of what is known as a Perrotcontrol, that is, a control including an operating shaft which is supported by the chassis frame at one end and is universally jointed at its other end to the applying means of the brake, the joint being substantially at the swiveling axis of the wheel.

In one desirable arrangement, the brake is arranged with its applying device at one side,

the device preferably including an operating lever which extends radially inward, the applying device being connected by means such as an upwardly extending link to an arm arranged 4between the web of the upper shoe and the backing plate and which is carried by an operating shaft j ournaled in a bearing carried by the backing plate behind the web of the upper shoe and which in turn is universally jointed to the usual operating shaft of the Perrot control.

The above and other objects and features of the invention, including various novel and I desirable details of construction, will be apparent from the following description of oneillustrative embodiment of the invention shown in the accompanying drawing, in which:

35 Figure 1 is a vertical section through the brake just inside the head of the brake drum and showing the brake shoes in side elevation;

Figure 2 is a partial section on the line 2 2 of Figure 1, showing the details of thc 40 Perrot control; and

Figure 3 yis a'lpartial section on the line 3 3 of Figure 1, showing the connection between the Perrot control and the applying device of the brake.

The brake selected for illustration includes a rotatable drum lat the open side of which is arranged a support such as a backing plate 12 carried by the wheel knuckle 14 and within which is arranged the friction means of the 50 brake. AThe illust-rated friction means is of the shiftable-anchorage type and preferably includes a pair of shoes 16 and 18 connected by a suitable adjustable pivot connection 20 and is arranged t-o be applied against the resistance of a main return spring 22 tensioned 55 between the shoes and an auxiliary return spring 24 tensioned between the shoe 1 6 and the arm of the Perrot control which is furtherdescribed below. The brake is so arranged that when the drum' is turning clock` wise, the shoe 16 anchors against a fixed post 26 carried by the backing plate and extending through a slot in the end of the shoe, while when the drum is turning count-erclockwise, shoe 18 anchors in a similarnianner on another such post 28.

The brake is arrangedl to be applied by means such as a floating lever 30 carrying a pair of thrust blocks 32 engaging the ends of the shoes and which is mounted at its inner end on a pivot 34 formed on a radial lever 36 which extends between the ends of the shoes and is pivoted on a fulcrum pivot 38 carried by the backing plate. The inner end of the lever 36 is connected by means such as a vertical link 40 to an operating arm 42 keyed on the end of a shaft44 journaled in a bearing 46 carried by the backing plate and arranged back of the web of the shoe 16 approximately at the top of the brake and behind the center of the shoe. The bearing 46 is shown formed with lug 48 engaging the rear face of the web rfif shoe 16 and serving as a steady rest there- The shaft 44 is connected in the usual manner by a suitable universal joint 50 with the control shaft 52 of a Perrot control, this being the shaft which is slidably and universally supported inthe usual manner on the-'chassis frame at its inner end and which is provided with a lever or the like connected to thebrake rod which forms a part of' the brake hookup.

It will be seen that when the shaft- 52 is rocked in appl ing the brakes it will turn the arm 42 upwar ly against the resistance of return spring 24 to operate the applying device of which the radial lever 36 forms a part. It will be noted also that the tensioning of the spring 24 in applying the brake 10 2 :,esaaeoxs tends to shift the shoe 16 toward the right in Figure 1 so that its ri hthand end will engage the drum before the rake is fully applied to make sure that one end or the other of the l friction device 16--18 will be in enga ement with its anchor 26 or 28 before the ricton dmeans is in full engagement with thev brake rum.

While one illustrative embodiment lhas been described in'detail, it is not my intention to limit the scope of the invention to this particular embodiment or otherwise than by the terms of the appended claims.

I claim:

'15 1. A brake comprising a backing plate having friction means mounted thereon, in combination with a floating applying device for the friction means at one side of the backing plate, a support at the top of the backing 2.0 plate, a shaft journaled in the support and having an operating arm, a spring tensioned between said arm and the friction means, and a link connecting said arm and the applying device.

2. A brake comprising a backing plate having a pair of shoes mounted thereon, in combination with an applying device for said shoes adjacent their ends and including a lever extending radially inward, a bearing 30 carried by the backing plate back of the web of one of said shoes approximately at its center, a shaft journaled in said bearing and havingan operating arm arranged between said web of the shoe and the backing plate,

and an operating link connecting said arm and said lever.

3. A brake comprising a backing plate having a pair of shoes mounted thereon, in combination with an applying device for said shoes adjacent their ends and including an operating lever, a bearing carried by the backing plate back of the web of one of said shoes approximately at its center and having a lug sldably engaging the back of said web and serving as a steady rest therefor, a shaft journaled in said bearing and having an operating arm arranged between said web of the shoe and the backin plate, and means connecting said arm and said lever.

5o In testimony whereof, I have hereunto signed my name.

KARL M. YOST. 

